Burglar-alarm.



PATENTED DEC. 31, 1907.

U. MAGNI.

BURGLAR ALARM.

APPLICATION FILED mm". 25. 1901.

lowing is a specification.

. 1 designates the prrrrrin scare rarnrrr ca r es. v UMBERTO MAGNI, OFSAN FRANGISCQ, CnLIFORNIA.

BURGLAR-ALARM.

Specification of Letters Patent. Patented Dec. 31, 1907.

Application filed June 25. 1907. Eleria'l llo. 380.732

T 0 all whom it mag concern;

Be it known that I, UMBERTO l\'.lAGNI, l and surrounding the firing pin2, is a coil residing at San Francisco, in the county of spring.4,whichis adapted to project the firing San Francisco and State of California,have pin into its cartridge firing position, the

invented certain new and useful Improvel casing 1 ments inBurglar-Alarms, of which the folend apertured to receive the firing pin2 and to form an abutment for the spring 4.-

My invention relates to certain new and useful improvements in burglaralarms of the detonating type, and it particularly has for its object toprovide an alarm of this character of a simple and effectiveconstruction, which can easily and cheaply be manufactured and whichwill readily serve its intended purposes. I l

In its generic nature, theinvention embodies a cartridge holder andfiring mechan ism, such mechanism including a firing pin, and means. fornormally holding the firing pin in its cocked position, together with adoor operated device for releasing the firing pin to explode acartridge, with a cartridge holder detachably secured to the firingmechanism and forming a cooperative part thereof.

ln'its more subordinate features my invention embodies certain novelconstruction, combination and detailed arrangement of. parts, all ofwlfch will be first described, then be specifically pointed out in the apended claims, reference being made to tiie accompanying drawings, inwlnch,.-

Figure 1, is a perspective view of my invention a plied for use. Fig. 2,is a central, vertical ongitudinal section thereof, the parts casing 1is a U shaped having bayonet slots 5 in its side Walls to cooperate withthe slots 1" of the casing 1 and through which slots 5* the handlecarrying rod, projects. The trigger 5 has a knob on. its u per face tocooperate with the door engaging lever member l0 hereinafter referredto, which is apertured to receive the knob 5 and which is adapted toproject unthe sill of the door.

\Nithin the trigger 5, and between the up per wall and the correspondingwall if the casing l is a leaf spring 6 secured at 6 to the casing I andadapted to normally press the free end of the trigger 5 upwardly so thatwhen the parts are in the position shown in Figs. 1 and .2 of thedrawings, the firingpin will be held back by resting in the 'tion fi ofthe bayonet slots.

At the front the casing 1 is an apertured threaded projectionprovidedwith 7 which is that is internally threaded at 8 and adapted tobe screwed upon 7 as shown, the cartridgeholder 8 having'a receivingbore 8* terminating in the cartridge bein in their cocked position. Fig.3, is a flange engaging member 8 to engage the v v sirrn ar viewshowingthe position of the parts head 9* of the cartridge 9 WlllCll maybe an ordinary blank cartridge.

The cartridge holder'8 is milled at 8 to enable it to be unscrewed andscrewed on as conditions may require, for purposes'of re loading thedevice.

In the practical a tion a cartridge is p shown in Fig. 2 of thedrawings, and the firing pin 2 is drawn back until the trigger si terthe cartridge has been fired. Fig. 4, is a cross section on the line4-4: of Fig. 2. 'Fig. '5, is a horizontal section on the line 55 of Fig.3. Fig. 6, is a detail view of the cartridge holder removed. Fig. 7 is adetail perspective view of the firing pin removed.

Referring now to the accompanying draw ings in which like numbers andletters of reference indicate like arts in all of the figures, rinmechanism which comprises the casing 1 in which tl1e,firin.g

plication of my invention, as indicated in Figs. 1 and 2 of the I Withinthe chamber 1 of the casing 1 llingedly secured at 5, to the rear of thetrigger member 5 der the door and have its prongs 10 under aced in theholder 8, as

having a knob portion 1 at its rear 1 short poradapted to receive thecartridge holder 8 the threaded projection member 5 holds the same inits cocked pos1- pin 2 is drawings. The member 10 is then projected withan internal chamber l -to receive the beneath the door and the partsarranged in the position shown in Fig. 1. .As soon as the door is o)encd the pressure upon the member 10 will cause the trigger 5 to bedepressed and will thereby release .the firing pin which engages thepriming of the cartridge and explodes the samein a manner wellunderstood longitudinal slots 1 in its side walls through which the rod3 projects, the rod 3 passing through the enlarged head 2 of the firingpin 2 and carrying finger enga ing handle members 3* at its ends, asclear y held, the casing 1 being provided l firing pin and j l shown inFig. 1, of the drawings.

by reference to the drawings. This causes it loud noise and awakens theo ireupents of the house.

From the foregoing description taken in connection with the accompanyingdrawings it is thought the complete construction, operation and numerousadvantages of my inven tion will be readily understood by those skilledin the art to which the invention zippertsins and. it will hefurthermore noticed that the threaded projc :tion 7 has its bore of lessdiameter then the external diameter of the head of thciiring. pin andthus forms an eutomatic stop for the firing pin when in its firingposition.

What I claim is,

1. An. epparzitns of the class described, comprisin it easing, hsving'aninternal bore, a. firing pin held therein, trigger devices Within thecasing for cooperating with the firing pin, a cartridge holderdetschebly screwed to one end of said casing, means for holding saidfiringpin cocked, met-ins for releasing said holding means, said.holding means'comprising a U-shruped trigger ")ivotslly secured to saidcasing one end, it eterelly projecting rod carried by said firing pinand projecting through slots in said casing, said trigger having meansfor coi'rperzitively engaging said rod for holding the trigger cocked,means interposed between. thetrigger and the casing for normally holdingthe trigger in its cocking osition, substantially as shown and describe1' 2. An apparatus of comprising a casing having on internal boreterminating at its front end in a reduced threaded portion, at cartridgeholder having threads for co jperstiug with said reduced the classdescribed,

l l l l l thresded portion, a firing pin held within said casingsndhering s head of greater diameter than the diameter of the reducedpor tion of the casing and having an elongated shank portion, :1 coilspring held within said casing and around said. shank portion and inengagement with the head ortion of the iirin pin, said casing a IOt'projecting through said firing pin and slots, and he ving fingerengaging ends, a substantially U-sheped trigger pivoted at one end tosaid casing and having bayonet slots through which said rod projects,means interposed between the trigger and the casin for normally holdingthe trigger in one posltion and separate means 006 eratively connectingthe trigger with the diver for moving the some to another osition as thedoor is opened, substsntia 1y as shown and described.

3. A device of the class described c0mprising a casing, a cartridgeholder removably fastened at one end of the casing, 21 firingpin heldwithin the casing, a, substantially U-shEjSe'd trigger member pivoted onthe outside of the casing and embracing the same, means carried by thefiring-pin for cooperatively engaging the trigger member, separate meansadapted to be engaged by the door or other movable article and. inengagement with said trigger. for depressing the trigger to release thefiring pin and means for normally tendhaving s ots in its sides,

ing to elevate'the trigger substantially as shown and described.

Witnesses LOUIS CONTAMONTL' 'AnAcLETo PIA OENTI.

UMBERTO MAGNI. 4

